I don't know that it's possible to know when to stop taking meds. That's something you definitely need to talk to your doctors about.
A warning...a lot of people feel better and think they can just stop taking their meds on their own, not realizing that it is the meds that are actually making them feel better. You quit, you relapse, and the whole cycle starts over again.
I may be on meds for depression for the rest of my life. I've come to terms with it in the same way I've dealt with other illnesses. I'm diabetic. I wouldn't stop taking my diabetes medication just because I felt OK. I also have asthma. I wouldn't throw away my inhaler just because I hadn't had an attack in a while.
The stigma of mental illness will not go away if those of us who suffer from them stop feeling guilty about being sick. (Sorry, I'm feeling a little militant tonight I guess.) It's not our fault.
So, when to stop your meds needs to be a decision between you and your doctors. Some medications cannot be abrupty discontinued. You need to be weaned off of them or you can have bad side effects.
take care - lb